Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.8 on date 31-07-2023 and time 22:49:44 (UTC) in region 3 km NE Acquasanta Terme (AP)

A magnitude ML 1.8 earthquake occured in region: 3 km NE Acquasanta Terme (AP), on

  • 31-07-2023 22:49:44 (UTC)
  • 01-08-2023 00:49:44 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.7980, 13.4280 at 19 km depth.

The earthquake was located by: Sala Sismica INGV-Roma.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Acquasanta Terme AP 3 2916 2916
Roccafluvione AP 8 2010 4926
Valle Castellana TE 9 977 5903
Montegallo AP 9 523 6426
Venarotta AP 11 2066 8492
Arquata del Tronto AP 11 1178 9670
Palmiano AP 12 196 9866
Ascoli Piceno AP 14 49407 59273
Montemonaco AP 14 604 59877
Rocca Santa Maria TE 15 537 60414
Folignano AP 17 9241 69655
Montefortino FM 18 1178 70833
Comunanza AP 18 3166 73999
Accumoli RI 19 667 74666
Force AP 19 1354 76020
Civitella del Tronto TE 20 5116 81136

Municipalities with at least 50000 inhabitants

An earthquake occurred to
27 Km NW of Teramo (54892 inhabitants)
50 Km N of L'Aquila (69753 inhabitants)
62 Km E of Foligno (57155 inhabitants)
67 Km W of Montesilvano (53738 inhabitants)
69 Km E of Terni (111501 inhabitants)
74 Km NW of Pescara (121014 inhabitants)
78 Km NW of Chieti (51815 inhabitants)
91 Km E of Perugia (166134 inhabitants)
91 Km S of Ancona (100861 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Reviewed
Rev100 		ML 1.8 2023-07-31
22:49:44		 42.7983 13.4278 19 2023-07-31
22:59:34		 Sala Sismica INGV-Roma 119740191
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-07-31 22:49:44 ± 0.06
Latitude 42.7983 ± 0.0018
Longitude 13.4278 ± 0.0037
Depth (km) 19 ± 1 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 100 -> SURVEY-INGV
Event type earthquake
Origin ID 119740191

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 298
Semi-minor axis of confidence ellipse (meter) 143
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 254
Circular confidence region, given by single value of horizontal uncertainty (meter) 300.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 78
Number of associated phases, regardless of their use for origin computation 51
Number of defining phases 51
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.17
Epicentral distance of station closest to the epicenter (degree) 0.04766
Epicentral distance of station farthest from the epicenter (degree) 0.80669
Number of stations at which the event was observed 28
Number of stations from which data was used for origin computation 28
Magnitude information

ML:1.8

Field Value
Value 1.8
Uncertainty 0.4
Num. used stations 38
Type of magnitude ML
Reference to an origin 119740191
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-07-31 22:59:34
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ASSB.HHZ. 2023-07-31T22:50:05.60 1.0 undecidable manual S 294 68.0763 98 0.38 21
IV.FIAM.HHZ. 2023-07-31T22:50:04.44 0.6 undecidable manual S 203 64.0914 99 0.28 43
IV.ARRO.EHZ. 2023-07-31T22:50:02.98 0.6 undecidable manual S 246 59.1963 100 0.1 45
IV.MML1.EHZ. 2023-07-31T22:50:00.94 0.6 undecidable manual S 313 50.9157 102 0.23 44
IV.GAVE.EHZ. 2023-07-31T22:49:59.36 0.6 undecidable manual S 255 45.0216 104 0.19 46
IV.SSFR.HHZ. 2023-07-31T22:49:59.61 0.6 negative manual P 324 87.9453 96 0.13 42
IV.MURB.HHZ. 2023-07-31T22:49:59.99 1.0 negative manual P 305 89.5437 96 0.27 20
IV.ARVD.HHZ. 2023-07-31T22:49:59.58 1.0 positive manual P 333 87.0462 96 0.25 21
IV.CESX.HHZ. 2023-07-31T22:49:57.29 0.6 undecidable manual P 253 71.7726 98 0.3 42
IV.LNSS.HHZ. 2023-07-31T22:49:57.93 0.6 undecidable manual S 236 38.3283 107 0.49 43
IV.CSP1.EHZ. 2023-07-31T22:49:57.28 0.6 undecidable manual S 331 37.2294 107 0.12 46
IV.RM33.EHZ. 2023-07-31T22:49:57.37 0.6 undecidable manual S 209 36.5412 108 0.39 44
IV.FDMO.HHZ. 2023-07-31T22:49:57.36 0.6 undecidable manual S 314 38.2284 107 -0.06 47
IV.GIGS.HHZ. 2023-07-31T22:49:57.80 0.6 undecidable manual S 163 40.1265 106 -0.09 46
IV.ASSB.HHZ. 2023-07-31T22:49:56.28 0.6 undecidable manual P 294 68.0763 98 -0.16 43
IV.MNTT.EHZ. 2023-07-31T22:49:56.24 0.6 undecidable manual S 25 32.2455 111 0.34 44
IV.ARRO.EHZ. 2023-07-31T22:49:55.10 0.6 negative manual P 246 59.1963 100 0.02 45
IV.CAMP.HHZ. 2023-07-31T22:49:55.29 0.6 undecidable manual S 183 29.1486 113 0.15 47
IV.FIAM.HHZ. 2023-07-31T22:49:55.57 0.1 undecidable manual P 203 64.0914 99 -0.25 85
IV.TERO.HHZ. 2023-07-31T22:49:54.13 0.6 undecidable manual S 144 24.1536 119 0.19 47
IV.NRCA.HHZ. 2023-07-31T22:49:54.45 0.6 undecidable manual S 279 25.8519 117 0.12 48
IV.MF5.EHZ. 2023-07-31T22:49:53.67 0.6 undecidable manual S 7 21.1677 123 0.42 44
IV.SMA1.EHZ. 2023-07-31T22:49:53.22 0.6 undecidable manual S 202 20.0688 125 0.2 47
IV.MC2.EHE. 2023-07-31T22:49:53.81 0.6 undecidable manual S 303 23.1546 121 0.11 48
IV.MML1.EHZ. 2023-07-31T22:49:53.58 0.6 negative manual P 313 50.9157 102 -0.25 44
7F.SIB1.EHZ. 2023-07-31T22:49:52.36 0.6 undecidable manual S 310 16.6722 131 0.05 49
IV.GAVE.EHZ. 2023-07-31T22:49:52.93 0.1 undecidable manual P 255 45.0216 104 -0.01 93
IV.RM33.EHZ. 2023-07-31T22:49:51.59 0.1 undecidable manual P 209 36.5412 108 -0.09 93
IV.FDMO.HHZ. 2023-07-31T22:49:51.64 0.1 negative manual P 314 38.2284 107 -0.29 89
7F.SIB2.EHN. 2023-07-31T22:49:51.64 0.6 undecidable manual S 316 14.3745 136 -0.23 48
IV.MMO1.EHZ. 2023-07-31T22:49:51.61 0.6 undecidable manual S 324 13.875 138 -0.16 48
IV.MNTT.EHZ. 2023-07-31T22:49:51.41 0.1 positive manual P 25 32.2455 111 0.35 89
IV.GIGS.HHZ. 2023-07-31T22:49:51.88 1.0 undecidable manual P 163 40.1265 106 -0.32 22
7F.SIB3.EHN. 2023-07-31T22:49:51.91 0.6 undecidable manual S 304 15.3735 134 -0.15 48
IV.LNSS.HHZ. 2023-07-31T22:49:51.92 0.1 undecidable manual P 236 38.3283 107 -0.02 94
IV.CSP1.EHZ. 2023-07-31T22:49:51.53 0.1 negative manual P 331 37.2294 107 -0.25 90
IV.ASCOL.EHN. 2023-07-31T22:49:51.51 0.3 undecidable manual S 66 14.3745 136 -0.36 70
IV.NRCA.HHZ. 2023-07-31T22:49:50.08 0.1 undecidable manual P 279 25.8519 117 -0.07 95
IV.CAMP.HHZ. 2023-07-31T22:49:50.48 0.1 undecidable manual P 183 29.1486 113 -0.14 93
IV.OFFI.HHE. 2023-07-31T22:49:50.51 0.1 undecidable manual P 54 25.8519 117 0.35 89
IV.MTRA.EHZ. 2023-07-31T22:49:50.63 0.3 undecidable manual S 209 5.2947 162 0.03 74
IV.TERO.HHZ. 2023-07-31T22:49:49.73 1.0 undecidable manual P 144 24.1536 119 -0.2 23
IV.MF5.EHZ. 2023-07-31T22:49:49.62 0.1 undecidable manual P 7 21.1677 123 0.09 96
IV.SMA1.EHZ. 2023-07-31T22:49:49.47 0.1 undecidable manual P 202 20.0688 125 0.08 97
IV.MC2.EHE. 2023-07-31T22:49:49.81 0.1 undecidable manual P 303 23.1546 121 0.03 97
IV.ASCOL.EHN. 2023-07-31T22:49:48.54 0.1 undecidable manual P 66 14.3745 136 -0.19 96
IV.MTRA.EHZ. 2023-07-31T22:49:48.01 0.1 negative manual P 209 5.2947 162 0.01 100
7F.SIB1.EHZ. 2023-07-31T22:49:48.94 0.1 undecidable manual P 310 16.6722 131 -0.05 98
7F.SIB2.EHN. 2023-07-31T22:49:48.50 0.1 undecidable manual P 316 14.3745 136 -0.23 95
IV.MMO1.EHZ. 2023-07-31T22:49:48.48 0.1 undecidable manual P 324 13.875 138 -0.2 95
7F.SIB3.EHN. 2023-07-31T22:49:48.70 0.1 undecidable manual P 304 15.3735 134 -0.13 96
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.MTRA.HNN. ML:2.1 0.0010474999999999998 0.2 AML other m 2023-07-31T22:49:50.70
IV.MTRA.EHN. ML:2.1 0.0010955 0.2 AML other m 2023-07-31T22:49:50.70
IV.MTRA.HNE. ML:2.1 0.0011719999999999999 0.1 AML other m 2023-07-31T22:49:50.70
IV.MTRA.EHE. ML:2.1 0.001186 0.1 AML other m 2023-07-31T22:49:50.70
IV.MMO1.EHE. ML:1.6 0.000304 1.48 AML other m 2023-07-31T22:49:51.75
IV.MMO1.EHN. ML:1.7 0.000374 0.2 AML other m 2023-07-31T22:49:52.18
IV.SMA1.EHN. ML:2.3 0.001215 0.28 AML other m 2023-07-31T22:49:53.46
IV.SMA1.EHE. ML:2.3 0.001145 0.24 AML other m 2023-07-31T22:49:53.52
IV.NRCA.HNN. ML:2.8 0.0030999999999999995 0.14 AML other m 2023-07-31T22:49:54.68
IV.NRCA.HHN. ML:2.9 0.003415 0.14 AML other m 2023-07-31T22:49:54.68
IV.NRCA.HHE. ML:2.6 0.001835 0.16 AML other m 2023-07-31T22:49:54.87
IV.NRCA.HNE. ML:2.5 0.00166 0.16 AML other m 2023-07-31T22:49:54.87
IV.CAMP.HHN. ML:1.5 0.00013000000000000002 0.32 AML other m 2023-07-31T22:49:55.63
IV.CAMP.HHE. ML:1.5 0.0001465 0.2 AML other m 2023-07-31T22:49:55.54
IV.RM33.EHN. ML:1.5 0.00011495 0.74 AML other m 2023-07-31T22:49:57.49
IV.CSP1.EHN. ML:2.1 0.0004005 0.3 AML other m 2023-07-31T22:49:57.57
IV.FDMO.HHN. ML:1.8 0.0001975 0.96 AML other m 2023-07-31T22:49:57.69
IV.CSP1.EHE. ML:2.2 0.00054 0.36 AML other m 2023-07-31T22:49:57.58
IV.FDMO.HHE. ML:1.7 0.00016299999999999998 0.22 AML other m 2023-07-31T22:49:57.68
IV.MNTT.EHN. ML:1.8 0.00027600000000000004 1.18 AML other m 2023-07-31T22:49:57.96
IV.LNSS.HHE. ML:1.9 0.0002595 0.26 AML other m 2023-07-31T22:49:58.24
IV.RM33.EHE. ML:1.4 0.00007980000000000002 0.22 AML other m 2023-07-31T22:49:58.24
IV.LNSS.HHN. ML:1.8 0.00022849999999999997 0.22 AML other m 2023-07-31T22:49:58.29
IV.GIGS.HHE. ML:0.8 0.000017999999999999997 1.54 AML other m 2023-07-31T22:49:58.80
IV.GIGS.HHN. ML:0.7 0.0000154 0.68 AML other m 2023-07-31T22:49:59.41
IV.GAVE.EHN. ML:2.0 0.0002755 1.02 AML other m 2023-07-31T22:50:00.33
IV.GAVE.EHE. ML:1.9 0.000237 0.22 AML other m 2023-07-31T22:50:00.81
IV.MML1.EHN. ML:1.4 0.0000635 0.62 AML other m 2023-07-31T22:50:01.57
IV.MML1.EHE. ML:1.3 0.00005044999999999999 0.76 AML other m 2023-07-31T22:50:02.04
IV.MNTT.EHE. ML:1.7 0.00021349999999999999 0.4 AML other m 2023-07-31T22:50:03.62
IV.ARRO.EHN. ML:1.3 0.000040100000000000006 0.48 AML other m 2023-07-31T22:50:05.37
IV.ARRO.EHE. ML:1.4 0.00005095 0.24 AML other m 2023-07-31T22:50:05.55
IV.ASSB.HHE. ML:1.5 0.00005395 0.66 AML other m 2023-07-31T22:50:06.58
IV.ASSB.HHN. ML:1.5 0.00005259999999999999 0.42 AML other m 2023-07-31T22:50:07.17
IV.SSFR.HHE. ML:1.5 0.00003655 0.26 AML other m 2023-07-31T22:50:13.48
IV.SSFR.HHN. ML:1.6 0.00004775 0.3 AML other m 2023-07-31T22:50:14.08
IV.MURB.HHE. ML:1.7 0.00005935 0.28 AML other m 2023-07-31T22:50:14.56
IV.MURB.HHN. ML:1.6 0.00004515 1.32 AML other m 2023-07-31T22:50:17.83
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download